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JInternalFrame isnt working why

Hello,

I'm trying to write a JFrame with a JInternalFrame. I have JMenuBar and JMenuItem when I click it,it should open new JInternalFrame.

The problem is when I use JDesktopPane it overwrites my mainFraim.getContentPane(). And when I try to add JDesktopPane into
mainFraim.getContentPane().add(JDesktopPane) it doesnt work can you pls help me to find why? or try to figure out how to add it into my mainFrame.